package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;
import java.util.*;

/**
 *  Version 3.0  升级   双向链接【客户端与服务器相互说话】
 *
 *  优化空间：代码结构、流没有关闭
 */
public class Server {
    private ServerSocket serverSocket;
    private Map<String,String>userDatabase;
    public Server() {
        userDatabase = new HashMap<>();
        userDatabase.put("user1", "password1");
        userDatabase.put("user2", "password2");
        try {
            serverSocket=new ServerSocket(6666);
        } catch (BindException e){
            System.out.println("端口号重复申请，建议换个端口号");
        } catch (IOException e) {
            System.out.println("申请端口号失败....");
        }
    }

    public void start(){
        try {
            while(true) {
                System.out.println("----等待客户端链接-----");
               Socket socket = serverSocket.accept();
                String ip = socket.getInetAddress().getHostAddress();
                System.out.println(ip + "客户端链接成功了");

                new Thread(new CS(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {
            if (serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                    System.out.println("服务器关闭失败");
                }
            }
        }
    }

    public static void main(String[] args) {
        Server server=new Server();
        server.start();
    }
    private class CS implements Runnable{

        private Socket socket;

       private String ip;
       private String username;
       private String  password;
        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }
        public void run() {

            PrintWriter pw = null;
           // BufferedReader br=null;

            try {
                //1.读入定义
                BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                //2.写出定义
                pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")), true);


               //1.1读入功能：存线程中
                new Thread(() -> {

                    try {
                        String message;
                        while ((message = br.readLine()) != null) {
                            System.out.println("客户端说：" + message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器端请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败！");
                    }

                }).start();
                //2.1 提供写方法，控制台输入
                Scanner input=new Scanner(System.in);//控制台卡住
                while(true){
                    System.out.println("服务器请输入：");
                   String say= input.nextLine(); //得到控制台输入值
                    //打印服务器端说的文本---打印客户端
                   pw.println(say);

                }
            } catch (NullPointerException e) {
                System.out.println("IO流传入对象，" +
                        "有对象为null！立马核对，" +
                        "建议：查看try块中对象可能赋值为null");
            } catch (UnsupportedEncodingException e) {
                System.out.println("客户端或者服务器端：字符集不一致");
            } catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误！");

            } finally {

//                if (br != null)
//                    try {
//                        br.close();
//                    } catch (IOException e) {
//                        System.out.println("结束通讯：关闭失败！");
//                    }关闭失败

                if (socket != null && !socket.isClosed()) {
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("服务器关闭失败");
                    }
                }
            }
        }
    }
}
